tree 4d8ada51919645b140b1ee5d25e2b37690d414fe
parent 7cbb39d4d4d530dff12f2ff06ed6c85c504ba91a
author Oleg Nesterov <oleg@redhat.com> 1396453505 +0200
committer Linus Torvalds <torvalds@linux-foundation.org> 1396480821 -0700

pid_namespace: pidns_get() should check task_active_pid_ns() != NULL

pidns_get()->get_pid_ns() can hit ns == NULL. This task_struct can't
go away, but task_active_pid_ns(task) is NULL if release_task(task)
was already called. Alternatively we could change get_pid_ns(ns) to
check ns != NULL, but it seems that other callers are fine.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Eric W. Biederman ebiederm@xmission.com>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>